Polymer functionalization with manganites

We investigated the transport properties of a series of composites made of La 2/3 Sr 1/3 MnO 3 and different copolymers. The temperature dependence of the electrical resistance of the samples is strongly dependent on the nature of the polymers. We found four types of temperature dependences of the electrical resistance: i) simple current dependence of resistivity for poly(methyl-methacrylate-co-styrene) copolymers, ii) single peaked characteristics for poly(acryl amide-co-vinyl acetate) , iii) multipeaked dependence found in poly(methyl-methacrylate-co-butadiene) and star type polysiloxane-gstyrene, and iv) current independent characteristics visible in the samples made with linear polysiloxane-based composites.